Info
While debugging another ticket I noticed the following WT connection string is being used by MongoDB:
2019-05-29T04:15:12.786+0000 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=7272M,session_max=33000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),verbose=(checkpoint_progress),
This comes from the following string generation code in WiredTigerKVEngine::WiredTigerKVEngine():
ss << "verbose=(recovery_progress),";
ss << "verbose=(checkpoint_progress),";
if (shouldLog(::mongo::logger::LogComponent::kStorageRecovery,
logger::LogSeverity::Debug(3))) {
ss << "verbose=(recovery),";
}
If a configuration option is repeated, verbose=(recovery_progress),verbose=(checkpoint_progress), the last option overwrites the prior options.
So, in this case, we would never put verbose output for recovery-progress. If the above if-condition is true "verbose=(recovery)" will overwrite other verbose types.
It is best to construct a verbose option string of the following form:
verbose=[recovery_progress,checkpoint_progress,recovery]
It is worthwhile evaluating if there are other WT options that might be getting overwritten and ignored like the above case.
Top User Comments
xgen-internal-githook commented on Fri, 21 Jun 2019 17:39:15 +0000:
Author:
{'name': 'Zach Yam', 'username': 'zachyam', 'email': 'zach.yam@mongodb.com'}
Message: SERVER-41352 Incorrect verbose configuration in the wiredtiger connection string
(cherry picked from commit 99e7f57e7e5eb63f22e2b582a10e78c197b835e6)
Branch: v4.2
https://github.com/mongodb/mongo/commit/a96d4f23f20fb34244a299a1e9008689e96af346
xgen-internal-githook commented on Tue, 18 Jun 2019 16:54:47 +0000:
Author:
{'name': 'Zach Yam', 'email': 'zach.yam@mongodb.com', 'username': 'zachyam'}
Message: SERVER-41352 Incorrect verbose configuration in the wiredtiger connection string
Branch: master
https://github.com/mongodb/mongo/commit/99e7f57e7e5eb63f22e2b582a10e78c197b835e6
